Add another PowerVR exception for FileSystemPermissionTest.

On platforms with a PowerVR GPU and newer device drivers, the /dev/pvr_sync
device node may be created to support the Android Native Fence Sync
functionality present in JellyBean MR1 and later (if enabled in the platform
and GPU driver).

This device node is used by any process using EGL/GLES, which includes system
processes such as SurfaceFlinger and most sandboxed native/java applications.

It is therefore not possible to use only group-writable permissions.

Imagination Technologies believe that the pvr_sync device driver is secure and
has been properly audited.

Change-Id: I60f56303e6fa015721bb5a034e6d47f57a5e2176
diff --git a/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java b/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java
index 8edf1d0..eaea367 100644
--- a/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java
+++ b/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java
@@ -755,6 +755,7 @@
                 new File("/dev/nvmap"),       // b/9088251
                 new File("/dev/ptmx"),        // b/9088251
                 new File("/dev/pvrsrvkm"),    // b/9108170
+                new File("/dev/pvr_sync"),
                 new File("/dev/random"),
                 new File("/dev/snfc_cen"),
                 new File("/dev/snfc_hsel"),